Sparking plug for internal combustion engines



Jan. 16," 1934. G. E. WO6DS-HUMPHERY ET AL 9 5 SPARKING PLUG FOR INTERNAL COMBUSTION ENGINES Filed March 23, 1933 STATES PATENT OFF SPARKING PLUG F03 INTERNAL COMBUSTION ENGINES George Edward Woods-Humphex'y, Chelsea, llamelou, and Henry Leonard Hell,

don, England Application ltleiels 23,

Strestham, low

loss, scoot so, seems,

cud to greet Esteem 19, little This invemicu to spotting plugs ice the electrical ignition oi combustible charges,

and has for its object less susceptible than existing types which will be the production of e plus to short-circuiting excising from the bridging of the spark esp oy cerlooii, ture end which need to permit of the some oil, or other mois= not be token to pieces being cleeued. A further object is to so construct the plus that weer oi the electrodes due limits the life of minimum.

A sparking plug invention is electrode is of to arcing end cleeuiue; which the plug, is reduced to e constructed according to the characterized by time following, tl'iot:--tl1e lieed oi" the inner endof the centi'eil e'ppi'oximemly cylindro-conicsl form; the insulation thereon extends to the imnet" face of sold heed; oi the plug is furnished with. e plurality the inner end of the body of ner= row fingers looming between some s, plurality of com'espoudiugly narrow ports through which iusuletiue msteriol isdirectly exposed to sud scsvenged by the flames of combustion;

and

further e cyliodiricel annular specs may be pro= vided between the insulating materiel around the central electro body, said specs extending well beck.

interior ol? the loo iectious, which in lingers on the inner end of the well of the into the and the exposed end oi he provided on its exislly disposed procouiunctiou with the uses-ow body, provide do and the inner dill;

plurality oi sparking edges.

in the eccompenyiuc' this iuveutionz l is e,

losing in section, of one form of drawing which illus= view in elevotion, one hell the improved Figure 2 is e, similar view of a, modification.

Figure 3 is en the plug shown in Figure i is s.

end view of the inner end of Figure 2.

view in elevation of the R218? end oil a, plug illustrating e modificetiou, end,

Figure l, plug is bored order to leave an illustreted in ennuler space Zloetween the insulation material 3 which surrounds the com tral electrode d body, said space e and the interior wall of the xtending well back from the head of the plug into the body, that is, as shown in Figure 1, the annular space extends back to the shoulder 5 by portion including means of which the central the electrode 4 is clamped (GE. fiil filitll es desited. codes that the flames of com.

bustion mey i'cecli the insulation materiel 3 he hind the heed 7 01'. tile electrode 4, the extreme twinner e d l of the body is provided with s plain cylindiicel portion beyond the tlu'eede'd portion and this portion is cestelleted so as to provide s. plurality oil-narrow fingers 8 which maybe deformed towards the head 7 of the cen- $5 tml electrode to loam e sparking gap or gaps end between some e conespondins number of ports 15.

For the pmoose ol extending the life of the see points the end 7.03 the central electrode W may too focused es as short cylinder moving smelly disposed ssooves 9 formed on its periphery so as to provide e plucefity of projections or sen'etious wlcicli constitute the positive gep points, whim mey ice brought into use simultaneously or suo= cessively, negative cop points being formed by the fingers s cm the plug body.

In the embodiment illustrated in Flames 2 and 3, the invention is shown applied to a, long reecli' plus of the type in which the central elec= trode is not remcvebly mounted in the body, othertvise tlie loi'metiou oi the central electrode and uegetive gap points is substantially the some so described with reference to Figure l, in which the ties of. the projections on the central electrode extend only to ithin sperls distance oi the inner diameter ot the lingers c on the body; said projections my, however, extend to time outee dismetcr fol sold fingers es shown in Figuses 4i cud 5i. hi this cese the fingers s ere ersensed to outer grooves it provided in the end oi time oi the control electrode, the projec= tious ii on sold electrode thereby losing disposed between time fingers 53.

met We claims is:-- v

i. ll sperms plus lot internal combustion eugiues in which the heed oi the inner end of the control electrode is of oppi'ouimetely cylindrocoolcel ions, the iiisuletims materiel thereon exe- 4.21 sparking pIug for internal combustion engines as claimed in claim 1 in which the innet or exposed cylindro-conical end of the central electrode is provided with axially disposed projections on the periphery of the cylindrical portion extending to the outer diameter of and between the fingers on the body.

GEORGE EDWARD WOODS HUMPI-IERY. HENRY LEONARD HALL. 

